Saved Bookmarks
| 1. |
An ionic solid PQ crystallises in rock salt structure with density `4.0gm//cm^(3)`.If the radius of cation and anion is 83 and 167 pm respectively, then the molar mass of solid is `[N_(A)=6xx10^(23)]`A. 75 gm/`cm^(3)`B. `50gm//cm^(3)`C. `25 gm//cm^(3)`D. `150gm//cm^(3)` |
|
Answer» Correct Answer - A `a=2[83+167]=500` pm `delta=(ZxxM)/(N_(A)xxa^(3)xx10^(-30))=(4xxM)/(6.02xx10^(23)xx[500]^(3)xx10^(-30))=4` M=75.25 gm / mole |
|